Hi Adriano!
First of all, thank you for Astrix. I wanted to send you some feedback after spending pretty much an entire day yesterday customizing the updated theme for my new publication.
I should say from the beginning that I’m very happy with the final result. Astrix gave me a really solid foundation and saved me from having to build or heavily redesign a Ghost theme from scratch.
That said, the customization process was definitely more involved than I initially expected.
I’m a fairly junior developer, so I’m comfortable digging into HTML, CSS and a bit of JavaScript, but I’m definitely not a Ghost theme expert. That made the process particularly interesting — and, at times, a test of my patience. 
The biggest issues I encountered were these:
1. The salmon color
This was, without question, the biggest headache.
I wanted to replace Astrix’s default salmon/pink accent with my web own brand color. I assumed this would be a relatively straightforward branding change, but the salmon color seemed to be integrated into several parts of the theme.
Finding exactly where it was coming from and making sure it was properly replaced required quite a bit of digging through the CSS.
For a publication rebranding Astrix, I think the primary accent color is one of the first things they are likely to want to change. Having a clearly exposed global accent-color variable or a documented place where the main theme color can be changed would make this much easier.
Honestly, the salmon color tested my patience more than anything else during the process. 
2. Author avatars and show_author_meta
This was another confusing one.
Ghost provides the show_author_meta option with:
- Name and avatar
- Name only
- Hidden
The description says that “Name only” drops the avatar, but selecting it didn’t actually remove the avatar from the individual post.
After digging through the theme, I found that the post itself was rendering another gh-author-avatar directly through post.hbs.
I eventually removed that markup from post.hbs, while deliberately keeping the avatar in author.hbs, because I wanted the author’s photo to remain visible on the author profile page.
So what I wanted was:
Individual post:
Author name, no avatar.
Author page:
Author photo, name and bio.
Once I understood the structure, it was easy enough to fix, but it took some investigation to figure out why the Ghost setting wasn’t producing the expected result.
3. Light/dark logos
I also wanted my page to use two different logo files depending on the color scheme.
The good news is that Astrix already has a pretty solid system / light / dark infrastructure. I really liked that part.
However, actually connecting separate light and dark logo assets required editing the header template and adding some CSS to control which image was displayed.
It worked very well in the end, but this is another area where a little more documentation — or a dedicated branding option — could make customization much easier.
4. Understanding where everything lives
This was probably the broader issue behind most of the work.
When trying to customize what should have been relatively simple things, I ended up having to investigate several files:
post.hbs
author.hbs
partials/post-hero.hbs
partials/post-card.hbs
partials/site-header.hbs
assets/built/screen.css
assets/built/main.js
None of these were particularly difficult once I found them, but figuring out which file controlled which part of the interface took time.
I think a short customization guide would be incredibly useful. Something like:
Want to change the post author metadata? → post.hbs
Want to change the author profile? → author.hbs
Want to change the header/logo? → site-header.hbs
Want to customize the color scheme? → main.js / CSS
Want to change the main accent color? → X
That kind of documentation could make Astrix much more approachable for people who are comfortable editing a theme but aren’t professional theme developers.
5. The overall experience
The interesting thing is that Astrix wasn’t actually difficult enough to make me abandon it.
Quite the opposite.
I downloaded the updated version one night and, by the following day, I had managed to turn it into something that feels very close to the identity I wanted for my page.
I didn’t spend several days fighting with fundamental problems. The theme is a very good foundation.
The frustration came mostly from discovering that some things appeared to already be solved through Ghost settings or the theme’s existing infrastructure, but then required manual intervention anyway.
If I had to summarize the experience in one sentence, it would be:
“I thought this was already solved, so why am I having to solve it manually?”
And, by the end:
“I now have a very good understanding of the theme’s internals — perhaps more than I initially wanted to have.” 
Still, I want to emphasize that I’m happy with the result and very glad I chose Astrix as the foundation for my project.
So thank you for building it, and I hope some of this feedback is useful for future versions.
And please, for the love of God, make the salmon easier to kill. 
Best,
Marcelo